package com.ruoyi;

import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.Logger;
import ch.qos.logback.classic.LoggerContext;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.slf4j.LoggerFactory;

import java.time.Duration;
import java.util.Collections;
import java.util.List;
import java.util.Properties;

/**
 * 消费者
 */
public class ConsumerQuickStart {

    static {
        LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();
        List<Logger> loggerList = loggerContext.getLoggerList();
        loggerList.forEach(logger -> {
            logger.setLevel(Level.INFO);
        });
    }

        public static void main(String[] args) {
        //1.添加kafka的配置信息
        Properties properties = new Properties();
        //kafka的连接地址
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "192.168.0.80:9092");
        //消费者组
        properties.put(ConsumerConfig.GROUP_ID_CONFIG, "group2");
        //消息的反序列化器
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");

        //手动提交偏移量
        properties.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);

        //2.消费者对象
        KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(properties);

        //3.订阅主题
        consumer.subscribe(Collections.singletonList("itheima-topic"));

        //当前线程一直处于监听状态'
            //同步和异步提交
        try{
            while (true) {
                //4.获取消息
                ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(5000));
                for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                    System.out.println(consumerRecord.key());
                    System.out.println(consumerRecord.value());
                    System.out.println(consumerRecord.partition());
                    System.out.println(consumerRecord.offset());
                }
                //异步提交偏移量
                consumer.commitAsync();
            }
        }catch (Exception e){
            e.printStackTrace();
            System.out.println("记录错误信息");
            //切换为同步提交(同步提交会重试，异步提交不会，因为异步提交频繁重试可能会导致偏移量覆盖)
            //同步提交
            consumer.commitSync();

        }finally {
            consumer.close();
        }


    }

}
